Knockdown frame for grindstones



(No Model.)

F. M. STEARNS.

KNOGKDOWN FRAME FOR GRINDSTONES.

No. 297.466. Patented Apr. 22, 1884.

A Iforneys NHED STATES ATENT rrrcn.

FRANK M. STEARNS, OF BEREA, OHIO.

SPECIFICATION forming part of Letters Patent No. 297,466, dated April22, 1884.

Application filed February '26, 1884. (N0 model.)

T0 at whom it may concern:

Be it known that I, FRANK M. STEARNS, of Berea, in the county ofOuyahoga and State of Ohio, have invented certain new and usefulImprovements in Knockdown G-rindstone- Frames; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same.

My invention relates to improvements in knockdown grindstone-frames, theobject being to provide a frame from which the legs may be easilyremoved for shipment and the parts as easily reassembled, and that whenthe parts are in position the structure will stand more firmly on itslegs than devices for this purpose heretofore in use.

WVith these objects in view my invention consists in certain features ofconstruction and .in combination of parts hereinafter described, andpointed out in the claims.

Knockdown grindstone-frames, to compete with the market prices, must becheap in initial cost, and so constructed that the parts may be easilyassembled at their destination. These qualities are embodied in avariety of this class of goods now on the market.

Another desirable feature that prior to my invention has not, to myknowledge, been embodied in a cheap knockdown grindstoneframe is thesecuring of the legs in such a manner that the frame will stand firm,and without weaving about on its legs with the motion of the crank. Theside pieces and cross-pieces at the end, forming the frame proper, areusually secured together permanently, while the legs are madedetachable. Gains are sometimes cut in the side pieces, in which tosecure the legs, and the legs usually are provided with shoulders, 011which the frame rests. The back walls of these gains were sometimesvertical, but were usually undercut, so that these walls, or two gainsforming a pair, were Wedgeshaped, the lines 0011- verging as theyextended downward. Two legs are usually secured-together, forming apair, and the undercut walls aforesaid rendered it easy to place thelegs in position. The legs were usually secured in their place in the 1gains by bolts or screws passing through the legs and into or throughthe frame. The difficulty with this construction was that when the boltsor screws were tightened the frame was not by this means drawn down uponthe shoulders of the legs, but by means of the undercut gains and theinclined face of the legs the frame was drawn away from the shoulders onthe legs by tightening the bolts, thereby materially decreasing thestiffness of the structnre.

My improvement consists in arranging each pair of gains so that the backwalls converge across the frame between the gains is considerably lessat, the top than at the bottom of the frame. If the legs were rigidlysecured together in pairs, of course they could not be placed inposition, and to overcome this diffr culty I make the cross-pieces thatsecure together the two legs, forming a piece sufficiently flexible, sothat the legs may be spread apart sufficiently to be placed in position,af ter which a loose-fitting bolt passing through the frame and the pairof legs is screwed up, binding the legs and frame firmly together.

is drawn down snug upon the shoulders of the le causing the structure tostand firmly and without any of that weaving motion so common toknockdown grindstone-frames.

In the accompanying drawings, Figure l is a View in perspective of myimproved grindstone-frame. Fig. 2 is a vertical section of the sidepieces of the frame and the upper portion of the legs, with thecross-pieces of the frame, the lower portion of the legs, andcrosspieces in elevation.

A represents the side pieces, and B the cross pieces, of the frame; 0,the legs, and D the cross-pieces uniting the legs in pairs. The parts Aand B are framed together in the usual manner, with short tenons on thelatter, and these parts are usually glued or nailed, so that they remainpermanently together. The side pieces, A, are gained, as shown at a, toreceive the legs, the back wall of these gains sloping downward andoutward, as shown in Fig. 2. The holes a are in the proper position forseas they eXtend upward, so that the distance In this case, bytightening the bolt, the frame curing the fittings that are usuallypacked in separate bundles for shipment. The legs are provided withshoulders c, on which the frame rests, and are connected in pairs by thecrosspieces D, that are made sufficiently flexible to admit of spreadingthe top of the legs, so that they may be placed in position in theirrespective gains a, and are therefore secured permanently on the partsD. The crosspieces B are grooved at b for the passage of the bolts E,that pass loosely through holes in the legs and side pieces, A.

When the parts are in position and the bolts are screwed up tight byreason of the inclined seats that engage the legs, the pieces A aredrawn down firmly on the shoulders 0 of the legs, making the structurestand firmly on the legs, so that the grindstone, when mounted thereon,may be made to do accurate work.

Vhat I claim is 1. In a knockdown grindstone-frame, the combination,with side pieces provided with the gains a, forming seats for the legs,as shown, of legs engaging the said gains, and provided with theshoulders c, and bolts for holding the legs in position, substantiallyas set forth.

2. In a knockdown grindstone-frame, the combination, with side pieces ofthe frame, provided with the gains,forming seats forthe legs, the innerwalls of said gains sloping downward and outward, of legs coupled inpairs by flexible cross-bars,and provided with the shoulders c, andbolts for securing the parts together, substantially as set forth.

3. The combination, with the parts Aand B, gained to form a frame, asshown, the former provided with the beveled gains a and the latter withthe grooves b, of the legs 0, provided with the shoulders c, and coupledin pairs by the flexible bar D, and secured by the bolt E, substantiallyas set forth.

In testimony whereof I sign this specification,in the presence of twowitnesses, this 21st day of February, 1884.

FRANK M. CTEARNS.

Vi tn esses:

G. A. HUBBARD, AMY MOCAULEY.

